… for agentic chat"

feat(chat):Added chat history storage to the Q chat for agentic chat

feat(chat): Updated model for Q Agnetic Chat APIs.

## Problem
Amazon Q Agentic Chat needs the ability to read files and directories
from the user's workspace to provide context-aware assistance.
Currently, there's no tool available for Amazon Q to access the file
system in a controlled and secure manner.

## Solution
- Implemented a new fsRead tool that allows Amazon Q to:
- Read entire files or specific line ranges
- List directory contents with configurable depth
- Handle error cases gracefully with informative messages
- Enforce size limits (30KB) to prevent excessive memory usage


## Testing

```
FsRead Unit Tests
extensionHostProcess.js:178
    ✔ reads entire file
extensionHostProcess.js:178
    ✔ reads partial lines of a file
extensionHostProcess.js:178
    ✔ lists directory contents up to depth = 1
extensionHostProcess.js:178
    ✔ throws error if path does not exist
extensionHostProcess.js:178
    ✔ throws error if content exceeds 30KB
extensionHostProcess.js:178
    ✔ invalid line range
```

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

feat(chat): Add validate method to fsRead tool

feat(chat): add fsWrite tool create command

## Problem
Setting up new Q Agentic Chat loop with tool use.

## Solution
Initial Agentic Chat loop Setup with tool use

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

feat(chat): add fsWrite tool commands

feat(amazonq): Adding openDiff and acceptDiff UX to the agentic chat.

feat(chat): Add executeBash tool for Amazon Q Agentic Chat

feat(chat): fix for q agentic chat loop

Merge master into feature/agentic-chat

feat(chat): Stream executeBash output to chat

feat(chat): add tool utils to delegate execution

feat(chat): use ChatStream to show tool description

feat(chat): add confirmation buttons and tool descriptions